Spraying immersion type energy storage battery box

Abstract

The utility model relates to the technical field of batteries, in particular to a spraying immersion type energy storage battery box which comprises a battery box body, a battery module arranged in the battery box body and a module flow self-adjusting spraying mechanism, the battery module is formed by assembling a plurality of battery cells, and spraying runners are preset among the battery cells; the module flow self-adjusting spraying mechanism comprises a flow adjusting floating rod and spraying arms distributed on each battery module; the spraying arm is provided with a spraying arm liquid outlet and a spraying arm liquid inlet; the top of the flow adjusting floating rod is located in the spraying arm, and the bottom of the flow adjusting floating rod penetrates through the bottom of the spraying arm and is provided with a valve port; a variable-diameter spraying opening is fixed to the top of the flow adjusting floating rod and right faces the spraying flow channel. According to the utility model, the battery module in the battery box is directly sprayed through the flow self-adjusting spraying mechanism, and meanwhile, the device has an insulating cooling liquid spraying flow self-adjusting function and a shortest heat conduction path, so that the phenomenon of temperature stratification is effectively avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a spray immersion type energy storage battery box. Background Art

[0002] Immersion liquid cooling technology is an advanced cooling technology that directly immerses heat-generating electronic products such as batteries in insulating coolant, so that the heat generated by the heat-generating electronic products is transferred to the insulating coolant and heat is exchanged with the outside world in a certain way to ensure that the battery operates within the optimal temperature range. Compared with traditional air cooling and liquid cooling technologies, immersion liquid cooling technology has been applied to battery energy storage systems in recent years due to its superior performance in cooling efficiency and safety.

[0003] Existing immersion energy storage battery systems usually use insulating liquid media to fill the power station battery box so that the battery modules placed inside are immersed. In actual work, immersion liquid cooling has a temperature stratification problem: because the density of the heated liquid decreases and gathers in the upper layer of the battery box, the battery box as a whole presents a temperature stratification phenomenon with the upper layer hot and the lower layer cold. The heat exchange rate between the battery modules at different positions and the insulating coolant is also uneven, further exacerbating the temperature stratification phenomenon.

[0004] In view of this, it is necessary to design a spray immersion energy storage battery box to overcome the above problems. Utility Model Content

[0005] The purpose of the utility model is to overcome the shortcomings of the prior art and propose to design a spray immersion energy storage battery box, which directly sprays the battery modules in the battery box through a flow self-regulating spray mechanism, and at the same time has the function of self-regulating the spray flow of insulating coolant and the shortest thermal conductivity path, effectively avoiding temperature stratification.

[0006] The utility model provides a spray immersion type energy storage battery box, comprising a battery box body, and also comprising:

[0007] A plurality of battery modules are arranged in the battery box body, wherein the battery modules are assembled from a plurality of battery cells, and a spray flow channel is preset between each battery cell;

[0008] The module flow self-regulating spray mechanism is arranged in the battery box body and is used to spray the insulating coolant;

[0009] Wherein, the module flow self-regulating spray mechanism includes:

[0010] The spray arms are evenly distributed on each battery module in the battery box body, with a spray arm liquid outlet at the bottom and a spray arm liquid inlet at the top;

[0011] The flow regulating float rod is hollow inside and has a density lower than that of the insulating coolant. The top of the flow regulating float rod is located in the spray arm, and the bottom thereof penetrates through the bottom of the spray arm and extends downward. A valve port is provided at the bottom of the flow regulating float rod.

[0012] The variable diameter spray port is fixed on the top of the flow regulating float rod, located at the liquid outlet of the spray arm, facing the preset spray flow channel between the battery cells.

[0013] The above technical solution, through the cooperation between the preset spray flow channel of the battery module and the module flow self-regulating spray mechanism, can directly spray (cool or preheat) the larger thermal conductive surface of the battery cell in a spraying manner, while making the battery module have the shortest thermal conductive path, effectively avoiding the temperature stratification phenomenon. The module flow self-regulating spray mechanism can also make each battery module in the battery box obtain a balanced spray volume, and convert the spray cooling of a specified battery box into full immersion cooling.

[0014] Furthermore, a battery box liquid inlet is provided at the upper portion of the battery box body, and a battery box liquid accumulation pool and a battery box liquid outlet are provided at the bottom; the battery box liquid inlet is connected to the spray arm liquid inlet.

[0015] Furthermore, the battery cell is installed on its side, and a protective cover plate is provided at the end of the battery cell, which can prevent the components installed on the side of the battery cell from being disturbed by the spray of insulating coolant.

[0016] Furthermore, the variable diameter spray port may be a regular figure eight structure or a cone or trumpet structure, so as to adjust the gap between the variable diameter spray port and the liquid outlet of the spray arm.

[0017] Furthermore, the flow regulating float rod includes a horizontal rod and a vertical rod, the horizontal rod is located inside the spray arm, the top of the vertical rod is fixed to the bottom of the horizontal rod, the bottom of the vertical rod passes through the bottom of the spray arm and extends downward, and a valve port is provided at the bottom of the vertical rod.

[0018] Furthermore, the tops of a plurality of spray arms are connected in parallel to a spray main pipe, and the spray main pipe is connected to a liquid inlet of the battery box.

[0019] Furthermore, the insulating coolant may be one of perfluorohexene, perfluorononene, and perfluorocarbon compounds.

[0020] Technical effects of the utility model:

[0021] Compared with the prior art, the utility model of a spray immersion type energy storage battery box, through the designed battery module structure and its matching battery module flow self-adjusting spray mechanism, has the function of automatically adjusting the battery module spray flow according to the liquid level in the battery box, and at the same time has the shortest thermal conductivity path, effectively avoiding the temperature stratification phenomenon; the utility model cancels the cumbersome flow detection and flow control unit on the secondary inlet and outlet pipes of each battery box in the traditional spray method, reduces the power consumption for flow detection and flow control unit, and has the beneficial effect of reducing costs and consumption. The utility model sets a valve port at the bottom of the flow adjustment float rod of the module flow self-adjusting spray mechanism. When the system detects that a specified battery box has an abnormality, it can quickly achieve continuous full immersion of the abnormal battery box, block the battery thermal runaway, prevent the thermal runaway from spreading, and through the phase change vaporization heat absorption characteristics of the insulating coolant, it can continuously cool to prevent the battery from reigniting, ensure the overall safety of the energy storage battery system, and minimize property losses. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the structural principle of the spray immersion energy storage battery box of the utility model;

[0023] Figure 2 This is a top view of the spray immersion energy storage battery box of the utility model.

[0024] In the figure, 1. battery box; 11. battery box liquid inlet; 12. battery box liquid outlet; 13. battery box liquid accumulation pool; 14. spray arm; 141. spray arm liquid outlet; 142. spray main pipe; 15. flow regulating float rod; 151. variable diameter spray port; 152. valve port; 16. spray flow channel; 17. battery module; 171. larger thermal conductive surface of battery cell; 172. pole ear; 173. protective cover. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the embodiments of the utility model clearer, the technical solution in the embodiments of the utility model is clearly and completely described below in conjunction with the accompanying drawings of the specification.

[0026] Embodiment 1:

[0027] like Figure 1 As shown, the present embodiment involves a spray immersion energy storage battery box, including a battery box body 1, a module flow self-regulating spray mechanism located in the battery box body 1, a plurality of battery modules 17, and an insulating coolant.

[0028] like Figure 1 and 2As shown, the battery box body 1 is provided with a battery box liquid inlet 11 on the upper part, and a battery box liquid accumulation pool 13 and a battery box liquid outlet 12 on the bottom; the battery module 17 is assembled from a plurality of battery cells, and a spray channel 16 is preset between each battery cell, so that the battery module 17 has the shortest heat conduction path along the direction of the spray channel 16.

[0029] like Figure 1 As shown, the battery cell is installed on its side, and a protective cover plate 173 is provided at the end of the battery cell, which can prevent the tabs 172, welding surfaces, sensors, wiring harnesses and other components installed on the side of the battery cell from being disturbed by the spray of insulating coolant.

[0030] like Figure 1 and 2 As shown, the module flow self-regulating spray mechanism includes a spray arm 14, a flow regulating float rod 15 and a variable diameter spray port 151. The spray arm 14 is evenly distributed on each battery module 17 in the battery box body 1. The spray arm 14 has a spray arm liquid outlet 141 at the bottom, and a spray arm liquid inlet is set at the top. The tops of several spray arms 14 are connected in parallel to the spray main pipe 142, and the spray main pipe 142 is connected to the battery box liquid inlet 11; the flow regulating float rod 15 is hollow inside and has a density lower than the density of the insulating coolant. The flow regulating float rod 15 includes a horizontal rod and a vertical rod. The horizontal rod is located inside the spray arm 14, the top of the vertical rod is fixed to the bottom of the horizontal rod, the bottom of the vertical rod passes through the bottom of the spray arm 14 and extends downward, and the bottom of the vertical rod is provided with a valve port 152; the variable diameter spray port 151 is a regular eight-shaped structure, fixed to the top of the flow regulating float rod 15, facing the preset spray flow channel 16 between the battery cells. When the energy storage battery box is working normally, the valve port 152 is normally closed, so that the module flow self-regulating spray mechanism can directly cool or preheat the larger heat-conducting surface 171 of the battery cell by spraying, and can make each battery module 17 in the battery box body 1 obtain a balanced spray volume. When the valve port 152 is opened, the insulating coolant in the battery box body 1 can be automatically filled into the flow regulating float rod 15. The flow regulating float rod 15 sinks because the volume density increases and exceeds the density of the insulating coolant, and its regulating effect on the spray flow is invalid. As the spraying continues, the liquid level in the battery box body 1 continues to rise, and the battery system can be continuously fully immersed, that is, the spray cooling of the specified battery box body 1 can be converted into full immersion cooling.

[0031] The insulating coolant described in this embodiment has the characteristics of insulation and flame retardancy or non-flammability, and is used to cool, keep warm or preheat the battery and inhibit thermal runaway. The insulating coolant is a battery-specific insulating coolant that has the three functions of cooling, insulation, and fire protection, and has good compatibility with all materials in the energy storage battery system. The insulating coolant is also a gas-liquid phase change material, which has the characteristics of phase change, vaporization and heat absorption in the liquid state. For example, the insulating coolant described in this embodiment can be one of perfluorohexene, perfluorononene or perfluorocarbon compounds.

[0032] Working principle: The utility model uses a module flow self-regulating spray mechanism to perform direct contact cooling on the larger heat-conducting surface 171 of the battery cell by spray cooling, thereby taking away the heat generated by the battery; the insulating coolant flows into the battery box liquid accumulation pool 13 at the bottom of the battery box body 1 under the action of gravity, and then flows out from the battery box liquid outlet 12 arranged at the bottom of the battery box liquid accumulation pool 13.

[0033] The module flow self-regulating spray mechanism automatically adjusts the spray flow to the battery module 17 according to the real-time liquid level of the battery box body 1 through the flow regulating float 15 which is hollow inside and has a density lower than that of the insulating coolant. The working principle is as follows:

[0034] When the insulating coolant level in the battery box body 1 rises, the flow regulating float rod 15 is pushed to float up, and the variable diameter spray port 151 fixed on the top of the flow regulating float rod 15 is a regular "eight" shaped structure. The flow regulating float rod 15 floats up and drives the variable diameter spray port 151 of the "eight" shaped structure to float up at the same time. The gap between the variable diameter spray port 151 and the spray arm liquid outlet 141 at the bottom of the spray arm 14 close to the battery module 17 becomes smaller, and the spray flow rate also decreases synchronously; the flow regulating float rod 15 continues to float up until its top contacts the top of the spray arm 14. At this time, the flow regulating float rod 15 is in the highest position, and the gap between the variable diameter spray port 151 and the spray arm liquid outlet 141 is the smallest, and the spray flow The amount reaches a minimum; while the spray flow rate decreases, the flow rate of the battery box liquid outlet 12 at the bottom of the battery box body 1 remains unchanged. When the spray volume of the battery box body 1 decreases to below the liquid outlet of the battery box body 1, the liquid level of the battery box body 1 gradually decreases. At this time, the flow regulating float rod 15 falls back and drives the "eight"-shaped structure variable diameter spray port 151 to move downward. The gap between the variable diameter spray port 151 and the spray arm liquid outlet 141 becomes larger, and the spray flow rate increases synchronously. When the spray volume of the battery box body 1 increases to be greater than the liquid outlet of the battery box body 1, the liquid level of the battery box body 1 rises, and the above process repeats itself to achieve the effect of automatic adjustment of the spray flow of the battery box body 1 and the liquid level of the battery box body 1.

[0035] The working principle of the battery box body 1 changing from the spray mode to the continuous full immersion mode is as follows:

[0036] The flow regulating float rod 15 is provided with a valve port 152 at the bottom. When the energy storage battery system is working normally, the valve port 152 is normally closed to ensure that the insulating coolant does not enter the inner cavity of the flow regulating float rod 15. When the battery management system (BMS) detects that the temperature of a battery module 17 is abnormal, the BMS sends a signal to the valve port 152 at the bottom of the flow regulating float rod 15 to which the abnormal battery module 17 belongs and opens it, and then the insulating coolant is automatically filled into the interior. After filling, the flow regulating float rod 15 sinks due to the increase in volume density exceeding the density of the insulating coolant, and its regulating effect on the spray flow fails. At this time, the spray flow of the battery module 17 is the largest, exceeding the liquid flow of the battery box body 1. As the spraying continues, the liquid level in the battery box body 1 continues to rise, and the battery system can be continuously fully immersed. The utility model controls the flow regulating float rod 15 through the valve port 152, so as to transform the specified battery box body 1 with abnormal temperature from the spray mode to the continuous full immersion mode.

[0037] The above-mentioned specific implementation methods are only specific cases of the present utility model. The patent protection scope of the present utility model includes but is not limited to the above-mentioned specific implementation methods. Any appropriate changes or modifications made to them by ordinary technicians in the relevant technical field in accordance with the claims of the present utility model shall fall within the patent protection scope of the present utility model.

Claims

1. A spray immersion energy storage battery box, comprising a battery box body (1), characterized in that: Also includes: A plurality of battery modules (17) are arranged in the battery box body (1), wherein the battery modules (17) are assembled from a plurality of battery cells, and a spray flow channel (16) is preset between each battery cell; A module flow self-regulating spraying mechanism is arranged in the battery box body (1) and is used for spraying insulating coolant; Wherein, the module flow self-regulating spray mechanism includes: The spray arms (14) are evenly distributed on each battery module (17) in the battery box body (1), the bottom of the spray arms (14) is provided with a spray arm liquid outlet (141), and the top is provided with a spray arm liquid inlet; The flow regulating float rod (15) is hollow inside and has a density lower than that of the insulating coolant. The top of the flow regulating float rod (15) is located in the spray arm (14), and the bottom thereof passes through the bottom of the spray arm (14) and extends downward. A valve port (152) is provided at the bottom of the flow regulating float rod (15); The variable diameter spray port (151) is fixed to the top of the flow regulating float rod (15), is located at the liquid outlet (141) of the spray arm, and is directly opposite to the spray flow channel (16) preset between the battery cells.

2. The spray immersion energy storage battery box according to claim 1, characterized in that: The battery box body (1) is provided with a battery box liquid inlet (11) at the top, and a battery box liquid accumulation pool (13) and a battery box liquid outlet (12) at the bottom; the battery box liquid inlet (11) is connected to the spray arm liquid inlet.

3. The spray immersion energy storage battery box according to claim 1, characterized in that: The battery cell is installed sideways, and a protective cover plate (173) is provided at the end of the battery cell.

4. The spray immersion energy storage battery box according to claim 1, characterized in that: The variable diameter spray port (151) is a regular figure eight structure or a cone or trumpet structure.

5. The spray immersion energy storage battery box according to claim 1, characterized in that: The flow regulating floating rod (15) comprises a horizontal rod and a vertical rod, wherein the horizontal rod is located inside the spray arm (14), the top of the vertical rod is fixed to the bottom of the horizontal rod, the bottom of the vertical rod passes through the bottom of the spray arm (14) and extends downward, and a valve port (152) is provided at the bottom of the vertical rod.

6. The spray immersion energy storage battery box according to claim 1, characterized in that: The tops of the plurality of spray arms (14) are connected in parallel to a spray main pipe (142), and the spray main pipe (142) is connected to a liquid inlet (11) of the battery box.

7. The spray immersion energy storage battery box according to any one of claims 1 to 6, characterized in that: The insulating coolant is one of perfluorohexene, perfluorononene and perfluorocarbon compounds.

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